<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- card视图 -->
    <el-card>
      <!-- 添加按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary" class="cateBtn" @click="classifyBtn">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 树形表单 -->
      <tree-table
        :data="catelist"
        :columns="columns"
        show-index
        :selection-type="false"
        :expand-type="false"
        border
      >
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted ===false" style="color:lightgreen"></i>
          <i class="el-icon-error" v-else style="color:res"></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag v-else-if="scope.row.cat_level===1" type="success">二级</el-tag>
          <el-tag v-else type="danger">三级</el-tag>
        </template>
        <template slot-scope="scope" slot="opt">
          <el-button
            type="primary"
            size="mini"
            icon="el-icon-edit"
            @click="editCatePop(scope.row.cat_id)"
          >编辑</el-button>
          <el-button
            type="danger"
            size="mini"
            icon="el-icon-delete"
            @click="deleteCataPop(scope.row.cat_id)"
          >删除</el-button>
        </template>
      </tree-table>

      <!-- 分页功能 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[5, 10, 15, 20]"
        :page-size="100"
        layout="total, sizes, prev, pager, next, jumper"
        :total="this.total"
      ></el-pagination>

      <!-- 添加分类弹框 -->
      <el-dialog title="提示" :visible.sync="classifyPop" width="50%" @close="addCateClose">
        <el-form ref="classifyRef" :model="classifyForm" label-width="100px" :rules="classifyRules">
          <el-form-item label="分类名称：" prop="cat_name">
            <el-input v-model="classifyForm.cat_name"></el-input>
          </el-form-item>
          <el-form-item label="父级分类：">
            <!-- options：用来指定数据源 -->
            <!-- props：用来指定配置对象 -->
            <el-cascader
              v-model="cascade"
              :options="parentCateList"
              :props="casCaderProps"
              @change="parentCateChange"
              clearable
            ></el-cascader>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="classifyPop = false">取 消</el-button>
          <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
      </el-dialog>

      <!-- 点击编辑按钮弹框 -->
      <el-dialog title="提示" :visible.sync="editCateVisible" width="50%">
        <el-form :model="editCateForm" :rules="editCateRules" ref="editCateRef" label-width="100px">
          <el-form-item label="分类名称" prop="cat_name">
            <el-input v-model="editCateForm.cat_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editCateVisible = false">取 消</el-button>
          <el-button type="primary" @click="daaEditPop">确 定</el-button>
        </span>
      </el-dialog>
    </el-card>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类的数据列表
      catelist: [],
      // 查询条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 总数据条数
      total: 0,
      // 为table指定列的定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      //  分类按钮
      classifyPop: false,
      classifyForm: {
        cat_name: '',
        // 父分类的ID
        cat_pid: 0,
        // 父类的等级 默认要添加的是一级分类
        cat_level: 0
      },
      //  验证
      classifyRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' },
          { min: 2, max: 5, message: '长度在 2 到 5 个字符', trigger: 'blur' }
        ]
      },
      //  获取父级的分类列表
      parentCateList: [],

      //  选中的父级分类的ID数组
      cascade: [],
      // 指定级联选择器的配置对象
      casCaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: true,
        expandTrigger: 'hove'
      },

      // 编辑按钮弹框
      editCateVisible: false,
      editCateForm: {
        cat_name: '',
        cat_id: ''
      },
      editCateRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' },
          { min: 2, max: 5, message: '长度在 2 到 5 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  // 生命周期
  created() {
    this.getCateList()
  },
  methods: {
    //  获取商品列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.querInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表错误！')
      }
      this.catelist = res.data.result
      this.total = res.data.total
    },

    //  监听pageSize
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newSize) {
      this.querInfo.pagenum = newSize
      this.getCateList()
    },

    // 分类弹框
    classifyBtn() {
      // 先获取父级的分类列表
      this.getParentCateList()
      // 在弹出提示框
      this.classifyPop = true
    },

    //  获取父级的分类列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级列表分类失败！')
      }
      this.parentCateList = res.data
    },

    // 级联框改变事件
    parentCateChange() {
      // 如果 cascade 数组中的length 大于0 证明选中的父级分类
      // 反之，就说明没有选中父级关系
      if (this.cascade.length > 0) {
        //  父级分类的id
        this.classifyForm.cat_pid = this.cascade[this.cascade.length - 1]
        //  为当前分类的等级赋值
        this.classifyForm.cat_level = this.cascade.length
        return
      } else {
        this.classifyForm.cat_pid = 0
        this.classifyForm.cat_level = 0
      }
    },

    //  点击按钮添加新的分类
    addCate() {
      this.$refs.classifyRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          'categories',
          this.classifyForm
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.classifyPop = false
      })
    },

    // 关闭清空弹框内容
    addCateClose() {
      this.$refs.classifyRef.resetFields()
      this.cascade = {}
      this.cascade.cat_pid = 0
      this.cascade.cat_level = 0
    },

    // 删除分类事件
    async deleteCataPop(id) {
      const deleteData = await this.$confirm(
        '此操作将永久删除, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (deleteData !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除分类失败！')
      }
      this.$message.success('删除分类成功！')
      await this.getCateList()
      if (this.total % this.querInfo.pagesize === 0) {
        this.querInfo.pagenum = this.querInfo.pagenum - 1
        this.getCateList()
      }
      this.classifyPop = false
    },

    // 查找分类
    async editCatePop(id) {
      const { data: res } = await this.$http.get('categories/' + id)
      this.editCateForm = res.data
      this.editCateVisible = true
    },

    // 确认修改分类事件
    async daaEditPop(id) {
      const { data: res } = await this.$http.put(
        'categories/' + this.editCateForm.cat_id,
        {
          cat_name: this.editCateForm.cat_name
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('修改分类失败')
      }
      this.$message.success('修改分类成功！')
      this.getCateList()
      this.editCateVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.cateBtn {
  margin-bottom: 15px;
}

.el-cascader {
  width: 100%;
}
</style>
